This week as the hike in VAT bites into your tech purchases, we look at the economics of technology.

Aleks Krotoski speaks to the head of Wikimedia, Sue Gardener, about how the world's free encyclopedia makes cash, and what effect their goal of "freely sharing the sum of all knowledge" will have on global social change.

Plus, Charles Arthur catches up with the author and futurist Doc Searls about the economies of the web – what keeps it going, and how you can make a million.